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#pragma once
#include <mbgl/util/variant.hpp>
#include <mbgl/style/undefined.hpp>
#include <mbgl/style/function/camera_function.hpp>
namespace mbgl {
namespace style {
/*
* Special-case implementation of (a subset of) the PropertyValue<T> interface
* used for building the HeatmapColor paint property traits class.
*/
class ColorRampPropertyValue {
private:
std::shared_ptr<expression::Expression> value;
friend bool operator==(const ColorRampPropertyValue& lhs, const ColorRampPropertyValue& rhs) {
return (lhs.isUndefined() && rhs.isUndefined()) || (lhs.value && rhs.value && *(lhs.value) == *(rhs.value));
}
friend bool operator!=(const ColorRampPropertyValue& lhs, const ColorRampPropertyValue& rhs) {
return !(lhs == rhs);
}
public:
ColorRampPropertyValue() : value(nullptr) {}
ColorRampPropertyValue(std::shared_ptr<expression::Expression> value_) : value(std::move(value_)) {}
bool isUndefined() const { return value.get() == nullptr; }
// noop, needed for batch evaluation of paint property values to compile
template <typename Evaluator>
Color evaluate(const Evaluator&, TimePoint = {}) const { return {}; }
Color evaluate(double rampEvaluationParameter) const {
const auto result = value->evaluate(expression::EvaluationContext({}, nullptr, {rampEvaluationParameter}));
return *expression::fromExpressionValue<Color>(*result);
}
bool isDataDriven() const { return false; }
bool hasDataDrivenPropertyDifference(const ColorRampPropertyValue&) const { return false; }
const expression::Expression& getExpression() const { return *value; }
};
} // namespace style
} // namespace mbgl
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